If you wish to have certain amount of space between the elements, you can add a spacer. To do that, click on the "+" sign in the left bottom corner and choose first the full layout row. Drag it between the blocks where you want to have space. After that, drag to the newly created empty block the spacer element.
Then you can regulate the width of the spacer, by dragging it up and down from the arrow.
You can add the spacer also directly between two elements, without using a layout row. For that, just drag the spacer element to the desired location.
You can also design the look of your template with spacers. For example, you can create blocks in your newsletter by adding spacers that are the same color as the background.